A "Rigid Body" is an idealized solid object that does not deform or change shape when forces are applied to it. In physics, it is assumed that the distances between any two points within the body remain constant, regardless of external influences. This simplification allows for easier analysis of motion and forces acting on the object. Rigid bodies can rotate and translate in space, and their motion can be described using concepts like torque, moment of inertia, and angular momentum. Common examples of rigid bodies include vehicles, buildings, and tools, which maintain their shape while interacting with other objects.